Effect of metal chelators on thermoluminescence peaks of spinach chloroplasts and photosystem II particles: probing the water oxidation cycle with 8-hydroxyquinoline.

Inhibition of photosystem II (PS II) activity by 8-hydroxyquinoline (8-HQ) has been investigated in case of spinach chloroplasts and isolated photosystem II particles using the thermoluminescence technique. In presence of 8-HQ, water to methylviologen (MV) photoreduction in isolated chloroplasts is inhibited while the reduction of dichlorophenol indophenol is inhibited in both chloroplasts as well as in photosystem II particles. The activity can be restored fully by addition of diphenylcarbazide (DPC), suggesting that the donor side of water oxidation complex is affected. The changes in the thermoluminescence peaks indicate that the charge recombination processes involving S2 or S3 states of the Kok's cycle are probably affected by 8-HQ treatment.

Efeito espermicida in vitro da associaçäo ácido bórico-sulfato de 8-hidroxiquinolina em pessários de manteiga de cacau / In vitro spermicidal effect of the combination of acid 8-hydroxyquinoline sulfate in vaginal suppository of cacao's butter

O autor demonstra, com técnica própria in vitro, que a associaçäo ácido bórico-quinosol apresenta marcante feito espermicida em 100% da populaçäo de espermatozóides em 10 lotes de sêmen humano testados